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v in (-oo:+oo)
(4*v+7)/15 = (6*v+2)/10 // - (6*v+2)/10
(4*v+7)/15-((6*v+2)/10) = 0
(4*v+7)/15+(-1*(6*v+2))/10 = 0
(10*(4*v+7))/(10*15)+(-1*15*(6*v+2))/(10*15) = 0
10*(4*v+7)-1*15*(6*v+2) = 0
40-50*v = 0
(40-50*v)/(10*15) = 0
(40-50*v)/(10*15) = 0 // * 10*15
40-50*v = 0
40-50*v = 0 // - 40
-50*v = -40 // : -50
v = -40/(-50)
v = 4/5
v = 4/5
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